diff --git a/dist/github-calendar.css b/dist/github-calendar.css
index 336c0df..29384e8 100644
--- a/dist/github-calendar.css
+++ b/dist/github-calendar.css
@@ -28,6 +28,7 @@
 
 table.ContributionCalendar-grid {
     margin-bottom: 0pt;
+    border-collapse: separate;
 }
 
 table.ContributionCalendar-grid td {